[Sacho]

Wouldn't a wireless keyboard that can send signals to your TV be a cheaper and less error-prone solution?

[Daviey]

A wired keyboard would be even more reliable and cheaper... but less convenient. This is the reason voice is being used, and it is more efficient on Amazon Prime etc.

[IanCal]

Since the remote already has this built in: no, it wouldn't be cheaper. Less error prone? Sure, occasionally, but it's surprisingly rare.

So it'd be a more expensive, bulkier option which is certainly more uncomfortable to use.